Re: Re: SCC1 as serial console

-----P?vodn? spr?va-----
Od: Laurent Pinchart [mailto:laurent=2Epinchart@tbox=2Ebiz]
Odoslan?: 22=2E m?ja 2006 14:12
Komu: linuxppc-embedded@ozlabs=2Eorg
Predmet: Re: SCC1 as serial console


Hi Ladislav,

quoted

can anybody help me to setup the SCC1 port as serial console on MPC8=

60 with

quoted

kernel 2=2E6=2E15=2E4? I would like to use it as system console duri=

ng the

quoted

booting proccess=2E I can not get any output on serial console durin=

g booting

quoted

proccess, I use uboot=2E

Does SCC1 work correctly in U-Boot ? If not, you should fix that first=

=2E I'll

assume it does=2E

Yes, it works fine for kernel 2=2E4=2E22=2E

There are many issues which could lead to a silent serial console=2E T=

he serial

port could be misconfigured, or the kernel could crash for another rea=

son

before the serial port is initialized=2E

I did a little experiment, I turn off the root file system so my kernel=
(system,=2E=2E) restart=20
after 180 seconds=2E When there was something wrong the there wasn't  s=
ystem restart=2E
But, ofcourse I CAN NOT be sure that this selince is due an another err=
or or I just can=20
not see the output=2E

Have you been able to get a serial console on another serial port (SMC=

) ? Are

the clock frequencies computed by U-Boot and passed to the Linux kerne=

l

correct ?

Please can you explain how to get thi serial to SMC?

Do you have a hardware debugger (BDI2000) that you can connect to the
processor to see if Linux crashes before initializing the serial port =

? If

not, you will probably have to take a try at led-debugging (make some =

leds

blink at various point in the Linux kernel to try to find out what hap=

pens),

but that's really no fun=2E

No I don't have any :(

Ladislav Klenovic_______________________________________________

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